Exchange striction induced giant ferroelectric polarization in copper based multiferroic material $\alpha$-Cu${}_2$V${}_2$O${}_7$

Abstract

We report $\alpha$-Cu${}_2$V${}_2$O${}_7$ to be an improper multiferroic with the simultaneous development of electric polarization and magnetization below $T_C$ = 35 K. The observed spontaneous polarization of magnitude 0.55 $\mu$Ccm${}^{-2}$ is highest among the copper based improper multiferroic materials. Our study demonstrates sizable amount of magneto-electric coupling below $T_C$ even with a low magnetic field. The theoretical calculations based on density functional theory (DFT) indicate magnetism in $\alpha$-Cu${}_2$V${}_2$O${}_7$ is a consequence of {\em ferro-orbital} ordering driven by polar lattice distortion due to the unique pyramidal (CuO${}_5$) environment of Cu. The spin orbit coupling (SOC) further stabilize orbital ordering and is crucial for magnetism. The calculations indicate that the origin of the giant ferroelectric polarization is primarily due to the symmetric exchange-striction mechanism and is corroborated by temperature dependent X-ray studies.

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• Ferroelectric order associated with an ordered occupancy at the octahedral site of the inverse spinel structure of multiferroic NiFe2O4
• Spin Seebeck effect in a polar antiferromagnet $\alpha$-Cu${}_2$V${}_2$O${}_7$
• High-field magnetization and magnetic phase diagram of $\alpha$-Cu${}_2$V${}_2$O${}_7$
• Natural ferroelectric order near ambient temperature in HoFeO3: A member of RFeO3 orthoferrites
• Magnetoelectric Behavior from $S=1/2$ Asymmetric Square Cupolas
• Spin wave excitations in the pyrovanadate alpha-Cu2V2O7
• Magnetoelastic coupling and ferromagnetic-type in-gap spin excitations in multiferroic $\alpha$-Cu${}_2$V${}_2$O${}_7$
• Commensurate to incommensurate magnetic phase transition in Honeycomb-lattice pyrovanadate Mn2V2O7
• The interplay of ferroelectricity and magneto-transport in non-magnetic moiré superlattices
• Interplay between trimer structure and magnetic ground state in Ba5Ru3O12 probed by Neutron and muSR techniques